A/C Pro ACP-102 Ultra Synthetic A/C Recharge R-134a Car Refrigerant helps make recharging your car's AC easy. This auto AC recharge features an AC stop leak additive that seals leaks in rubber hoses, gaskets and O-rings, and helps protect your AC system while providing 2x cooling boosters, versus the next leading brand of car AC recharge kits. This R-134a refrigerant helps eliminate acid and moisture buildup to protect and extend the AC system's life. Simply find the low-pressure port, read pressure and charge. Feel empowered to take on DIY car care, and refill the chill yourself with A/C Pro.